Office Chair Gas Spring

The gas spring in an office chair is the core mechanism responsible for lifting, rotating, and reclining, directly affecting sitting posture experience and safety.

Function and Principle

The gas spring achieves stepless adjustment and smooth damping through the interaction between compressed gas in a sealed chamber and a piston. In free-type gas springs, their core functions are to support body weight, adjust the reclining angle and rebound force, ensuring uniform damping during reclining without any jolts.

Features of High-Quality Gas Springs

1. Materials and Craftsmanship: Utilize thickened seamless steel tubes (wall thickness ≥ 2.0mm) and precisely ground piston rods, filled with high-purity nitrogen (purity ≥ 99.99%), and equipped with a double-layer oil seal design. The sealing rings are upgraded to aging-resistant fluororubber, passing a 24-hour fatigue test (simulating a 75 kg load, 6 lifts per minute for 100,000 cycles, with stroke decay ≤ 5%).
2. Performance: The chair surface remains stable in height without “slow air leakage” sinking; the damping is smooth during reclining, with long-lasting support force.

Problems with Ordinary Gas Springs

They use welded tubes with a wall thickness of less than 1.5mm, with sealing elements made of ordinary nitrile rubber and nitrogen purity of only about 90%. After three months of use, gas leakage and sealing element wear are prone to occur, leading to reduced stroke and support force decay.

Safety Standards and Lifespan

1. Materials and Sealing: The cylinder wall thickness, piston rod hardness, and anti-corrosion treatment must pass mechanical calculations and salt spray tests. The sealing elements must maintain a low leakage rate within the temperature range of -20℃ to 70℃, with an elastic recovery rate of ≥ 90% after long-term compression.
2. Fatigue Testing: Simulate 20,000 reclining operations per year, with 100,000 cycles resulting in a support force decay of ≤ 15%.
3. Pressure Relief Protection: When the internal pressure exceeds 1.5 times the design limit, the pressure relief groove or burst disc fails first to prevent sudden bursting.
4. Industry Lifespan Standards: Most manufacturers test for 30,000-50,000 cycles, while high-quality products can reach 100,000 cycles (calculating 10 lifts per day, they can be stably used for over 20 years).

Purchase Considerations

1. Lifespan Verification: Check third-party test reports and a full-process quality control system.
2. Force Value Accuracy: The error should be controlled within 3% (e.g., for gas springs corresponding to a load capacity of 100kg-150kg).
3. Safety Certification: The rod body must have a steel stamp标识 (marking), including international certifications (such as SGS, TÜV) and grade markings (Class 4 can withstand dynamic loads exceeding 200 kg, with a lifespan three times that of ordinary products).

Usage Habits

Avoid prolonged pressure at the maximum reclining position or violent bouncing; clean the piston rod dust every three months; avoid extreme temperature environments; regularly check for oil film on the rod body or abnormal friction marks, and immediately stop using and send for inspection if a sharp “hissing” sound is heard.